the ecobee3 smart thermostat is our favorite smart thermostat here at gearadvice. we love it particularly because of its tight integration with apple’s homekit and because it comes with extra sensors that allow the thermostat to more accurately understand how hot or cold your house is.without question, the headlining feature of the ecobee3 is the use of remote sensors, which serve two functions. along with telling the thermostat when someone is in an room, the sensors communicate the room’s temperature. this means it has finer control as to which rooms are hot or which rooms are cold, s...